Make the peas:
Cut two styrofoam balls in half and paint three halves in light green; let dry completely. Line up the "peas" onto dark green felt for sizing, and cut an oval base.
Glue painted halves onto the felt and attach to the center front of shirt. Layer the hoodie and zip up halfway.
Cut two pieces of felt in the shape of a curly stem. Hot glue two edges together and stuff with polyfil. Hot glue the remaining edge closed as you stuff. Cut a couple leaves and glue to the end of the curly stem. Safety pin to the top of the hood.